Unless the cam lobe(s) went flat (in other words is ruined during break in) or the camshaft is phased completely off (which I doubt) it's not the cam. Check you lash and cut your filter open and look for debris. Otherwise I'd suspect ignition problems, as I have seen 98% of the time on the dyno (my own dyno that is).
If lash was incorrect to begin with that would also be a problem. I would never let an engine off the dyno with a miss like that. We always will resolve prior to taking it off. That's what the dyno is for.
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